Barreiro was chief torturer at "La Perla". He participated in kidnappings and murders, and in hiding evidence of the
disappeared from the International Red Cross.

He was arrested and held at an Army base in April 1987 for his role in La Perla. He refused to
appear before the Court, and was supported by the military at the base where he was being held.
Other military followed suit occupying other bases. The crisis averted when President Alfonsin
went to one of the bases. A few weeks later, based on a proposal by Alfonsin, the Argentine Congress approved the Due
Obedience Law which amnestized almost all the military.

Barreiro was born in Buenos Aires and currently lives in Bahía Blanca. He is married to Ana Maggi and has four children.